Now that we're in with-contract land, use the same syntax parameter for units as well as with-contract and define/contract.
Now that we're in with-contract land, use the same syntax parameter for units
as well as with-contract and define/contract.

svn: r13181

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket